ImageMagick

Questions and postings pertaining to the usage of ImageMagick regardless of the interface. This includes the command-line utilities, as well as the C and C++ APIs. Usage questions are like "How do I use ImageMagick to create drop shadows?".

I'm aware that I can use "+dither -colors x" and get an image with x colors that is as close to the original image's colors as possible. But I can't, for example, use "-ordered-dither o8x8 -colors x" and achieve the same effects. It appears to me that "-ordered-dither" use 'posterized' color maps, and does not take account in the original image's palette, and while I can change the posterize level, I can't create an ordered dither that picks colors based on the current image contents.

If there's any way to achieve my goal please tell me, that would be extremely helpful.